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Probably not the right thread, but I didnt go with springs in the end. Because I have an arrangement with 3 parallel cells x 8S , I wanted to use fixed busbars across the 3 cells. I used 5mm neoprene between all cells. 1 bar (14psi) compresses almost exactly 1/2 the neoprene. So my 4 rows of 6...

I've read many resources on Top Balancing, including Nordkyn Design series and the Marinehowto article. (mind you my mind is exploding with the LiFePO4 learning curve I'm on at present !). I'm just about to order 52 x 3.2V 272AH Lishen cells from Basen for 2 sets of 24 cells (3 x 8 Cells each...

After ordering my cells (52 Lishen 272AH for 2 sets of 24 cells, with 4 spare), and a Heltec smart BMS 200A model for me to fiddle with, I've had cold feet on my plan to use this in my 'live' 2 installs. Reading more discussions of Mosfet vrs SSR vrs Relays for switching high currents etc and...

Just to add to the source threads about compression being desired.. The Lishen 272AH product spec sheet , last line says "The cell thickness was tested at 3000N pressure." Which I believe is 3000/9.8 = 306 kgf for the side being 201 x 174 mm = 0.87kg/cm2 = 12.4 psi Thickness is quoted as...

I bought 54 x Lishen 272AH Cells in Dec2020, arrived 7Apri21. All were good, no bulging. They were 're-wrapped' by Basen so I have my doubts as to being new ? I note now that they collect EU VAT with the order unless you provide VAT no for exemption. So called EU Polish stock still quotes...

Thanks for your concise replies.. but "very close" and "not very long" are the 2 numbers I'm trying to quantify a bit. Is Q5 1 , 10 , 100 ma ? other ? Re step from 3.4 to 3.5 and then 3.6 .. are times similar ? Is it 1 min, 10mins, 100mins, 1000 mins ? Sorry if I'm being pedantic , just...

Hi Tialiden, I'm a first timer newb too so were both learning. Most of those in these forums will not be doing these things multiple times. The key part of the BMS sheet to read is "Adjustable Protection Parameters" and secondly there are 2 versions, one for LTO and one for LiFePO4. The LiFePO4...

No sure where to best post this. I bought my cells (52 x 272Ah Lishen) from Shenzen Basen on 31Dec20 DDP to France (98day delivery) USD 4691.00 DDP to France. . I'm happy enough with the 2 packs I had installed (remotely from Australia) with 24 cells each for 816AH x 24V nominal. Used...

Sorry to open up this bit after such a delay, but I've reread these 'compression' threads from the beginning and are deeply interested in the best way to setup my 2 packs of 24 cells. I find the picture above very instructive. If a cell tries to expand when charged and is resisted by the case...

I found this thread very illuminating. I've bought 52 cells Lishen 272AH for 2 packs from Shezen Basen , ordered 21Dec20, delivered mid April to France (arrived in 2 sep lots). I paid AUD$100/cell (USD$70 approx inc shipment (and supposedly DDP so including VAT). USD $90 inc delivery. Mine...

I've now set the absorption and float volts to 29v, decided trying to deliberately taper charging using absorption v is too tricky. Also remember I'm charging at just 0.12C, not 1C like many of the tapering recommendations assume.

FYI . .i requested some quotes on Alibaba for 28 x 3.2V 280AH .. asked for Grade A , matched cells .. got 16 responses in 2 days .. Gloria from BasenGroup was the only one to fully answer my request.. (responses are latest first so read from the bottom). I am quite impressed with...

You can get smaller units .. eg 100AH .. add 4 of those and a BMS, and you have a 12V 100AH approx 1.2kwH unit.. similar prices per kwH

Thanks svetz for moving my post here.. I am considering disconnecting the batteries (and BMS) over winter. But I do need some 24V systems for safety (eg auto bilge pump). Also I prefer to monitor a security camera and weather station to know my boat (a 100 yo barge in France/BE/NL) is still...

Now a question about having 3 x 8S banks in parallel. Each with BMS. Q1. are their issues that prevent some BMS's from being used in that parallel ? Q2. If the BMS just shuts off one string due to a weak cell, it could increase current in (or out if under load) to the other 2. If the pack...

Some further questions if I may...hope their not too simple or repetitive ? Is there an 'official' definition of Grade A cells vrs Grade B ? And what qualifies as "Matched" . similar "balanced" (I presume at same Voltage and SOC, and thus capacity ?) And re discussion of an initial 'long'...

OK newbie here, first post so be gentle please.. I'm looking to get a 24 Cell 280AH LiFePO4 bank for 24V setup on my barge. If I run 3P8S I'm told I can run one 8S BMS, but my peak charge current is 2.4kw from a generator (plus 1kw of MPPT Solar) (100 Amps). Peak Discharge is 5kw (220 Amps) to...

Finally have a few cycles of our 24 x Lishen 8S3P 272AH (816 AH x 24V) pack. Controlled by Electrodacus. On a barge in France. Shore Power and a Generator are initial charge sources. (we hide from the sun so solar not great investment). Unlike inline BMS's that cut charging or load, the...

So stuffs getting real now. I've just ordered 52 x Lishen 272AH 3.2V cells from Basen (via Gloria Luo) at US$71 each, ship DDP to France for $999. I'm doing 2 boats now with 24 cells 272AH for about 19kwH useable each. Mine and a mates. Luckily its all rail transfer to France, so hopefully no...

No sure where to best post this. I bought my cells (52 x 272Ah Lishen) from Gloria at Shenzen Basen on 31Dec20 DDP to France (98day delivery) USD 4691.00 DDP to France. . I'm happy enough with the 2 packs I had installed (remotely from Australia) with 24 cells each for 816AH x 24V nominal. Used...

I believe I also have a older Quattro with no AUX IO ports. Note the line the PDF linked to above "The Multi or Quattro needs to be of a recent type that has auxiliary inputs." Talking to Dacian, he confirms I need SSRs to switch off the ACIn1 and ACIn2 on a signal from EXT IO4. Thats what I...

Observations of voltage behaviour... I'm experimenting with some tiny 6AH LiFePO4 and Electrodacus SBMS0 with Heltec 5A Active Balancer too sometimes.. and a bench 5A supply. For these cells 5A is almost 1C rate. I did an initial top balance with all in parallel to 3.6V. Now in series as a...

I'm planning my first install on my boat soon. It will spend 6-9 months idle in European winter etc. Ive chosen the Electrodacus for my BMS. I am concerned that Daican doesnt not believe it harmful to keep the batteries at 100% over winter. There does not seem to be a easy way to get it to...

To be clear on their pricing vrs raw LiFEPO4 cells. At AUD$1300 for a 300AH 12V unit thats $1.08 per raw AH 3.2V cell. DIY are available for AUD$110 for 280AH cells Lishen (from Basen) plus shipping. Shipping is approx $35/cell currently to AUS. Without shipping DIY is $0.39 /AH but with...

and 4 in parallel gives 400A max discharge and 200A charge.. so a reasonable config

So I’m relatively new to this DIY LiFePO4 batteries but need to get moving as my old 4 x 220AH Victron GEL’s are close to stuffed after only 4 busy seasons on my barge (500 cycles, but too many > 50% I think). I've be scouring these forums for info, and several other sources. I'm an Electrical...

From the Lishen 272AH Data Sheet.. (the batteries I have on order).. 5.4 Storage and Usage a) For any short time storage (in one month), cell should be in a clean and dry area （humidity ≤65% RH） and at -30℃ ~+45℃ at 20~40%SOC . b) For any long time storage (in 6 month), cell should be in a...

So I have ordered a Heltec 200Amp Smart BMS for delivery to me in Australia, to get some familiarity for it before I order 6 to got to France where my 52 x 272AH Lishen LiFEPO4 cells are going. https://www.aliexpress.com/item/1005001376655378.html?spm=2114.12010612.8148356.4.475a33a9Wh1Cip...

One soln suggested is to set the Victron devices to a float voltage of 26.2 V , which is 3.275V/cell.. I hadnt thought about using the Victron charge profiles to deliberately 'override' the SBMS0's desire to charge till HVD. (3.55V) every day all day if Shorepower or solar present. 3.275V is...

I like the look of this. Its closest to my thoughts at this stage.. My complication is I'm doing a 24 cell , 24V pack as 4 rows of 6 cells. Since each 'triplet' needs busbars, the complication of allowing movement means more complex connections of the 3. As designed below with 20mm x 1mm...